Locomotive.



Patented Sept. 2, I902.

L. ATWUOD.

LOCOIGTIVE.

(Application filed Aug. 3, 1901.]

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(No Modal.)

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No. 708,292. Patente d Sept. 2, I902.

L. ATWUUD.

LDCOMUTIVE.

(Application mad Aug. 8. 1901.) (N9 Model.) 2 Sheets-Sheet 2.

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LOCOMOTIVE.

SPECIFICATION forming part of Letters Patent No. 708,292, datedSeptember 2, 1902.

Application filed August 3, 1901. Serial No. 70,822. (No model.)

To aZZ whom it may concern.-

Be it known that I, LEONARD A'rwoon, a

citizen of the United States, residing in Phila:

delphia, Pennsylvania, have invented certain Improvements inLocomotives, of which the following is a specification.

The object of my invention is to improve the construction of thefire-boxes of locomo tives, so that the passage leading from thefire-box to the tubes of the boiler can be varied. This object I attainby making the bridge-wall and deflector in the fire-box adjustable. Ialso make these parts removable for the purpose fully describedhereinafter.

In the accompanying drawings, Figure 1 is a longitudinal sectional Viewof a locomotiveboiler, illustrating my invention. Fig. 2 is a transversesectional view on the line 2 2, Fig. 1. Fig. 3 is a side Viewillustrating the construction of the bearings for the trunnions of thebridge-wall and deflector.

A is the boiler, having a series of longitudinally-arranged tubes at,fitting the tubesheets a a Bis the fire-box of the boiler, having asuitable grate b.

D is a bridge-wall which is carried by a shaft cl, mounted in bearings cc in the side walls of the boiler, as shown in Fig. 2. By thisarrangement the bridgewa1l can be moved to any angle desired.

The bridge wall is preferably arranged some distance from the tube-sheeta, so as to form a combustion-chamber B back of the bridge-wall.Directly above this combustionchamber is a deflector D, mounted on ashaft d, journaled iubearings c in the side walls of the boiler, similarto the shaft d. This deflector can also be turned on its pivot tojacertain extent. Byadjusting the bridge-wall and the deflector the sizeof the combustionchamber can be increased or diminished and the passageleading from the'fire-box to the combustion-chamber can be varied asdesired. The bridge Wall and deflector are preferably made of a metallicframe having a facing of fire-brick. This construction may be varied andother materials used without departing from the essential features of myinvention. Back of the bridge-wall D in the present instance is anair-nozzle G, communicating with anair-passage Gr directly under theboiler, so that air under pressure may be projected from thevnozzle intothe combustion-chamber B. Any number of these nozzles may be used,according to the width The air-passage G communicates with the ash-pit3) directly under the grate b and, in fact, forms a continuation of thisash-pit; Dampers b b are arranged at the front and rear ends,respectively, of the ash-pit, and at the forward end of the air-passageis a damper I). These dampers can be set so that air can be admitted tothe ash-pit either under pressure or from the space in front of theair-chamber or rear of the firebox when it is not desired to run withair under pressure. The air-passage G communicates with a pipe Gconnected to a fan blower G which is driven by an engine E. (Shown indiagram, Fig. 2.) The shaft 6 of this engine is mounted in suitablebearings and carries the blades of the blower. By this construction airunder pressure can be forced either to the nozzles G or to the nozzlesand space under the grate. The blower may be run directly from themoving parts of the engine; but I prefer to supply an independent enginefor the blower, as indicated.

It will be noticed that the shafts d and cl, on which the bridge-Walland defllector are mounted, are square and have rounded trunnions. Iprefer this construction and use a bearing (shown in Fig. 3) which isarranged to fit in an opening in the boiler-casing, so that when it isdesired to remove either shaft, so that the bridge-Wall or the deflectorcan be detached, the bearing on one end is removed and the shaftwithdrawn. Then the bridge-wall or deflector, or both, can be drawn backto the rear end of the boiler, so that free access may be had to all thetubes. The shaft 66 has an arm (1 and the shaft (1 has an arm d Thesearms may be connected by rods to operating-levers in the cab of the 10-comotive or within easy access of the fireman, so that the parts can beadjusted while the locomotive is under way.

I have shown in Fig.2? of the drawings a fire-box narrower at the topthan at the bottom, so that the side walls are inclined, and thebridge-wall and deflector are shaped accordingly. When this constructionis used, it will be necessary to detach the deflector ICO when it iswished to gain access to the tubes; but if a fire-box having verticalside walls is used then it is not absolutely necessary to provide meansfor detaching the deflector except in the case of extended repairs.

I claim as my invention- 1. The combination in a boiler, of a fire-box,a tube-sheet and tubes, a pivoted bridge-Wall within the fire-box somedistance from the tube-sheet and forming a combustion-chamber, a gratewith external means for adjusting the bridge-wall to increase ordiminish the size of the combustion-chamber, substantially as described.

2. The combination in aboiler, ofa fire-box, a tube-sheet, and tubes, agrate, a bridge-wall within the fire-box some distance from thetube-sheet and forming a combustion-chamber, a pivoted deflector abovethe bridge-wall, with external means for adjusting the deflector toincrease or diminish the size of the combustion-chamber and the passageleading thereto from the fire-chamber, substantially as described.

3. The combinationin a boiler, of a fire-box, a grate, a pivotedbridge-wall, a pivoted deflector above the bridge-wall, means exteriorof the fire-box for adjusting both the bridgewall and the deflector,substantially as described.

4. The combination in a locomotive, of a fire-box, tubes leading fromthe fire-box, a grate, a bridge-wall back of the grate, a deflectorabove the bridge-wall, both the grate and the deflector being pivoted,with means exterior of the fire-box for turning both the bridge-Wall andthe deflector on their pivots so as to increase or diminish the passageleading from the fire-box to the tubes or to adjust the parts thataccess may be had to the tubes, substantially as described.

5. The combination in a boiler, of a fire-box, a grate, detachablebearings in the side walls of the fire-box, a pivot-shaft mounted insaid bearings and extending through the fire-box, a deflector so mountedon the shaft that when one of the bearings is detached the shaft can bewithdrawn to allow for the removal of the deflector, substantially asdescribed.

6. The combination in a boiler, of a fire-box, a grate, a pivotedbridge-wall, a pivoted defiector above the bridge-wall, shafts on whichthe said bridge-wall anddeflector are mounted, said shafts extendingthrough the side wall of the fire-box and detachable from the saidbridge -wall and deflector, substantially as and for the purposespecified.

7. The combination in a locomotive, of the fire-box, a grate, an ash-pitunder the grate, tubes leading from the fire-box, a pivoted bridge wall,a pivoted deflector mounted above the bridge-wall, an air-pipecommunicating with the combustion-chamber between the bridge-wall andthe tube-sheet, and an air-blast device for forcing air under pressu reinto the combustion-chamber and under the grate, substantially asdescribed.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses.

LEONARD ATWVOOD.

Witnesses:

WILL. A. BARR, J 0s. H. KLEIN.

